There were other, less-available prototypes prior to that.
> In June 2022, LaMDA gained widespread attention when Google engineer Blake Lemoine made claims that the chatbot had become sentient. The scientific community has largely rejected Lemoine's claims...
From https://en.wikipedia.org/wiki/LaMDA
Damn, that's crazy. Or at least in hindsight it is. I don't remember anything big deal being made about it back then.